Lesson 3: Mastering Tangent Arcs
Duration of Days: 1.5
Lesson Objective
Students will apply the Tangent snap and TTR methods to complete a complex mechanical cam or linkage.
How does the "Tangent" property change as you move the end of a line?
Can you identify where a line ends and a curve begins on a professional print?
Cam, Linkage, Point of Tangency.
CT CTE.AR-D.2.1: Demonstrate the use of radii and geometric construction.
Students complete Plate 2-3. This is a high-complexity plate requiring multiple tangent lines and TTR arcs.
Purpose: This serves as the "capstone" for the Tangency sub-unit.
DOK Level: 3.
Provide a "Geometry Map" highlighting exactly which points on the print require a "Tangent" snap vs. an "Endpoint" snap.
Evaluation of Plate 2-3 focusing on the "Smoothness" of transitions between lines and arcs.
CAD Book - Basic Mechanical Drafting 2-3.